Bowtie Display - Tektronix WFM8200 User Manual

Bowtie Display

Elements of the Bowtie
Display
Bowtie Display Pop-Up
Menu
WFM8200 and WFM8300 Waveform Monitors
The Bowtie Display is accessed from the MEAS button. This display allows
you to look at inter-channel timing between Y Pb and Y Pr. The left side of
the display compares Y and Pb; the right side compares Y and Pr. The Bowtie
Display requires a test signal with signals of slightly differing frequencies on the
chroma channels than on the luma channel.
If the bowtie patterns have a sharp null, and the null is at the center of each
line, the relative amplitudes and inter channel timing are correct. Interchannel
timing errors will move the position of the null. A relative amplitude error will
decrease the depth of the null. An incomplete null combined with an offset from
center indicates both amplitude and timing problems between the channels being
compared. (See Figure 26.)
Figure 26: Bowtie display
Display: Shows the display type as Bowtie.
Y-axis units: The units for the y-axis depend on the test signal and the signal
format.
X-axis units: Shows the x-axis in microseconds/divisions.
Parade / Overlay: Select how the waveform appears by selecting Parade
or Overlay.
Center Waveform: Press the SEL button to center the waveform.
Display Information
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